EP1868758B1 - Power miter saw with miter and bevel angles sensing units, and digital displays therefor - Google Patents

Power miter saw with miter and bevel angles sensing units, and digital displays therefor Download PDF

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Publication number
EP1868758B1
EP1868758B1 EP20060738198 EP06738198A EP1868758B1 EP 1868758 B1 EP1868758 B1 EP 1868758B1 EP 20060738198 EP20060738198 EP 20060738198 EP 06738198 A EP06738198 A EP 06738198A EP 1868758 B1 EP1868758 B1 EP 1868758B1
Authority
EP
European Patent Office
Prior art keywords
saw
shaft
bevel
miter
hollow cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20060738198
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1868758A1 (en
Inventor
Stephen C. Oberheim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1868758A1 publication Critical patent/EP1868758A1/en
Application granted granted Critical
Publication of EP1868758B1 publication Critical patent/EP1868758B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/04—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever
    • B23D45/042—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever with the saw blade carried by a pivoted lever
    • B23D45/046—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever with the saw blade carried by a pivoted lever the pivoted lever being mounted on a carriage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/001—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
    • B23D59/002—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade for the position of the saw blade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/768—Rotatable disc tool pair or tool and carrier
    • Y10T83/7684—With means to support work relative to tool[s]
    • Y10T83/7693—Tool moved relative to work-support during cutting
    • Y10T83/7697—Tool angularly adjustable relative to work-support
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/768—Rotatable disc tool pair or tool and carrier
    • Y10T83/7684—With means to support work relative to tool[s]
    • Y10T83/7701—Supporting surface and tool axis angularly related
    • Y10T83/7705—Adjustable angular relationship
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/768—Rotatable disc tool pair or tool and carrier
    • Y10T83/7684—With means to support work relative to tool[s]
    • Y10T83/7722—Support and tool relatively adjustable
    • Y10T83/7726—By movement of the tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/768—Rotatable disc tool pair or tool and carrier
    • Y10T83/7755—Carrier for rotatable tool movable during cutting
    • Y10T83/7788—Tool carrier oscillated or rotated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/849—With signal, scale, or indicator
    • Y10T83/853—Indicates tool position
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/849—With signal, scale, or indicator
    • Y10T83/853—Indicates tool position
    • Y10T83/855—Relative to another element
    • Y10T83/856—To work-engaging member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8773—Bevel or miter cut

Definitions

  • the present invention relates to a power miter saw according to the preambles of claims 1 and 30.
  • a saw is known from EP 1522363 A .
  • the more recent compound miter saw designs typically include detents for common settings that are required for miter angles for various types of trim and other carpentry work.
  • Specific bevel and miter angles are commonly used for cutting trim pieces for inside and outside corners in either a vertical or horizontal orientation, as well as to cut trim pieces for inside and outside corners of crown molding, for example.
  • Embodiments of the present invention are directed to a power compound miter saw having miter angle as well as bevel angle adjustment capabilities, with sensing units that can measure the angular position of the miter table relative to the base as well as the bevel angle of the blade relative to the table.
  • Such sensing units generate position signals that can be used to provide a digital display of the miter and bevel angles to a high degree of accuracy.
  • the embodiments utilize mechanisms which enable a user to tighten the pivot connections of the table and the base as well as the pivot connection between the table and the bevel pivot support housing without damaging the sensing units.
  • the sensing units are configured and mounted in such a way as to not interfere with access to the nut which can be rotated to vary the amount of friction between the adjacent components.
  • FIGS 1-9 of the drawings The preferred embodiment of the present invention is shown in FIGS 1-9 of the drawings and comprises a power sliding compound miter saw that has the capability of adjusting both the miter and bevel angles. It should be understood that the present invention may also be implemented in a miter saw that does not have the compound sliding capability.
  • the sensing unit structure may be useful in other applications where the angular position of one component relative to another is to be determined and where the two components may be required to be tightened relative to one another by the use of a nut on a shaft, which thereby necessitates the ability of the sensing unit to be axially moved along a shaft.
  • the two sensing unit structures that will be illustrated and described herein are not identical to one another, but share some functional commonality.
  • Both sensing unit structures may lend themselves to be used for different applications. Both sensing unit structures can produce highly accurate measurements of the miter and bevel angles, i.e., to at least 0.1 degrees which are displayed on a digital display located on the miter saw.
  • a compound miter saw indicated generally at 10 is shown in perspective and includes a saw base 12 that is preferably generally circular in its overall shape and which has downwardly extending legs for supporting the saw on a surface.
  • the saw 10 has a rotatable table, indicated generally at 14, which pivots around a central generally vertical shaft 16.
  • the table 14 can be positioned at different bevel angles by using a handle assembly, indicated generally at 18, that preferably includes a detent and release mechanism as well as a locking mechanism for setting the bevel angle of the saw.
  • the detent and release mechanism and the locking mechanism are not in and of themselves a necessary part of the present invention except insofar as some type of such mechanisms are required for such a compound miter saw 10.
  • the table 14 includes a bevel base portion 20 located at the rear thereof and has a generally horizontal shaft 22 that defines the horizontal axis for adjusting the bevel angle.
  • the shaft 22 supports a bevel pivot support housing, indicated generally at 24, that pivots relative to the bevel base portion 20.
  • the bevel pivot support housing 24 has openings in which a slideable carriage 26 is located with the carriage 26 supporting a saw blade and motor assembly, indicated generally at 28.
  • the blade and motor assembly 28 has a motor 30, a saw blade 32, a guard structure 34 and a handle 36.
  • the blade and motor assembly also pivots about a shaft 38 for bringing the saw blade downwardly into a cutting position.
  • the saw 10 has a fence 40 that is operatively connected to the base 12 for holding a work piece (not shown) in position to be cut.
  • the miter angle is measured by a miter angle sensing structure, indicated generally at 42
  • the bevel angle is measured by a bevel angle sensing structure, indicated generally at 44.
  • the table 14 is carried by the base 12 and the table 14 is rotatable about the shaft 16 which is tightly secured to the table by bolts 46 that are preferably screwed into threaded apertures of the base 12.
  • the shaft 16 extends through the base 12 which is preferably an aluminum die casting and has a flat annular boss 48 formed therein.
  • the shaft 16 also extends through the base 12 and has a threaded end portion which a threaded nut 50 is applied screwed onto.
  • the nut 50 controls the amount of friction that exists between the table 14 and the base 12 so that when it is tightened, it is more difficult to rotate the table relative to the base.
  • the sensing structure 42 is located between the base casting 12 and the nut 50 and comprises a thrust bearing 52, an angular position transducer, indicated generally at 54, which has an inner hollow cylinder 56, an outer cylindrical housing 58 and an anti-rotation keyed washer 60, which is located on the shaft 16 between the hollow cylinder 56 and the nut 50.
  • an anti-rotation pin 62 is preferably press-fit into a complimentary sized and shaped opening in the base casting 12 and its axis is preferably substantially parallel to the axis of the shaft 16.
  • An anti-rotation bracket 64 has a forked outer end portion that contacts the anti-rotation pin on opposite sides thereof and the bracket 64 is attached to the cylindrical housing 58 of the angular position transducer 54. Since the pin is secured to the base 12, the cylindrical housing 58 of the angular position transducer 54 is immobilized relative to the base 12.
  • the inner hollow shaft 56 is secured to the shaft 16 so that when the table is rotated relative to the base, the shaft 16 as well as the inner hollow cylinder 56 rotates relative to the cylindrical housing 58 of the angular position transducer and the angular position transducer 54 thereby generates signals that are indicative of the angular position of the table 14 relative to the base 12 of the saw.
  • An alternative embodiment of the pin and fork connection is shown in FIGS. 15A and 15B where the fork 64' has curved faces 51 so that there is only point contact on opposite sides of the pin 62.
  • another alternative embodiment is shown in FIGS.
  • the pin 62' has a smaller diameter base portion and an enlarged spherical end portion 53 that also ensures point contact on opposite sides of the spherical end portion 53 and the sides of the fork 64.
  • Both of these embodiments allow for relative angular misalignment between the pin and the fork which may occur during the manufacture of the saw 10. However, regardless of the misalignment, there are no resulting errors because point contact on opposite sides of the pin with the fork is maintained.
  • FIG. 14 An alternative embodiment of the sensing structure 42 is shown in FIG. 14 which comprises a string potentiometer or string driven transducer 43 mounted to the base 12 which has a string or flexible wire 45 that is wound around a string guide 47 and has its outer end attached to the string guide 47 by a screw 49 or the like.
  • the string is biased to retract the string and provides an electrical signal that is indicative of the length of the extended string. Therefore, as the string guide is rotated, electrical signals are generated that are proportional to the angular position of the table 14.
  • One of several configuration or mechanisms can be used to permit axial movement while resisting relative rotational movement between the inner hollow cylinder and the shaft 16. It is preferable that a rubber or rubber-like O-ring 65 be positioned between the inside diameter of the inner hollow cylinder 56 and the shaft 16 as shown in FIG. 9 .
  • the O-ring 65 should be sized so that it is placed in sufficient compression to insure that rotation of the shaft will result in rotation of the hollow cylinder 56 but also permit the limited axial movement that is necessary as a result of the tightening of the nut 50. While the use of the O-ring 65 is preferred, a tolerance ring as shown in FIG. 10 may also be employed.
  • a tolerance Ring is a precision-engineered device made from a thin spring steel strip of material into which waves, corrugations or bumps are formed. The strips are cut to length and curled into the ring shape. The waves are either facing inward or outward to accommodate different applications.
  • the waveforms are designed to preferably exert a rotational holding force while permitting axial movement.
  • a key or spline arrangement may also be used as shown in FIG. 11 .
  • a groove is cut or formed on the inside surface of the inner hollow cylinder 56 and in the outside of the shaft 16, and a key or spline 67 is placed in the grooves to prevent relative angular movement between them while permitting axial movement of the cylinder 56 along the shaft 16.
  • a principal consideration of these embodiments is the capability of maintaining angular nonslipping contact while permitting axial movement so that the angular position transducer 54 is not damaged by the axial movement of it when the nut is rotated to increase the friction between the base 12 and table 14.
  • the keyed washer 60 has an inwardly directed tang 64 that engages a groove 66 in the shaft 16.
  • FIG. 13 employs adjacent flats 69A and 69B which prevent relative rotation of the hollow cylinder 56, 72 and shaft 16, 22 while permitting sliding movement.
  • FIG. 13 shows a gap between the two components which in practice would not exist to the extent that any appreciable play would occur between these components.
  • the angular position transducer 54 is preferably a single rotation potentiometer that will actually rotate less than a full revolution as applied to the embodiment illustrated.
  • the table is generally limited in its rotation from a left 45° position to a right 45° position. Thus, only approximately 90° of rotation is used to generate the angular position signals that are sent to a display unit 68 that preferably has an internal microprocessor that is configured to receive the position signals from the sensing unit 42 and thereby generate a digital display of the angular position of the table.
  • the user can zero the display unit 68 by putting the miter saw into a detent zero position and pressing the zero button. In this zero position, the blade 32 is preferably exactly perpendicular to the plane of the fence 40. The user can also press a store button and store the current position.
  • the angle display unit 68 should be mounted on the saw table near the front for easy viewing, and may conveniently be located on the handle 18. While not discussed in detail, the bevel sensing structure 42 also produces signals that result in a digital display. It is preferred that the display unit 68 be able to display both the miter angle and the bevel angle, and have a button that allows switching between viewing the miter or bevel angle. Alternatively, there could be two displays units, i.e., one mounted near the front of the saw table that would display the miter angle and another display mounted near or on the bevel pivot support housing that would display the bevel angle. The display unit(s) will preferably show two numbers for each of the bevel and miter angles. One of these numbers preferably indicates the actual angle measurement and the other number preferably indicates a stored value or a calculated value that the user can use to adjust either the miter angle or the bevel angle until the two numbers are identical.
  • an angular position transducer 70 that includes an inner hollow cylinder 72 and a cylindrical housing 74 that is rotatable relative to the inner hollow cylinder and the shaft.
  • the angle position transducer v 70 generates signals indicating the angular position of the two cylinders relative to one another, and is mounted on the threaded shaft 22 and is held by an end nut 76 threaded onto the threaded shaft 22.
  • a keyed washer 78 is also provided between the inner hollow shaft 72 and the nut 76.
  • the keyed washer 78 and shaft 22 has substantially the same configuration as the keyed washer 60 shown in FIG.
  • the hollow cylinder 72 is held in place relative to the shaft 22 in a similar manner as the outer cylinder 56 is operatively connected to the vertical shaft 16.
  • an O-ring, spline or tolerance ring is used to prohibit relative rotational movement between the hollow cylinder 72 and the shaft 22, while permitting limited axial movement that may be necessary when the nut 76 is tightened on the shaft 22 for the purpose of increasing the amount of friction that exists during rotation of the bevel pivot support housing 24 and the bevel base portion 20.
  • the cylindrical housing 74 is operatively connected to the bevel pivot support housing 24 which causes the cylindrical housing 24 to move in unison with the bevel pivot support housing.
  • a bracket 80 that is similar to the bracket 63 on the miter sensing unit structure. In this regard, it has a forked end portion that contacts both sides of a pin 82 that is secured to the bevel base portion 20 of the table.
  • the angle position transducer 70 generates signals that are fed to the display 82 by connectors and conductors, not shown, and the display 82 may be located on the saw 10 at a convenient location that is visible to a user as previously described. As is the case with the display 68, if the display 82 is separate from the display 68, it would similarly have processing means incorporated into its design so that the position signals from the bevel sensing structure 44 can be converted to a digital display for viewing by an operator.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
EP20060738198 2005-04-15 2006-03-14 Power miter saw with miter and bevel angles sensing units, and digital displays therefor Active EP1868758B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/108,024 US7849774B2 (en) 2005-04-15 2005-04-15 Power miter saw having digital displays
PCT/US2006/009114 WO2006112982A1 (en) 2005-04-15 2006-03-14 Power miter saw with miter and bevel angles sensing units, and digital displays therefor

Publications (2)

Publication Number Publication Date
EP1868758A1 EP1868758A1 (en) 2007-12-26
EP1868758B1 true EP1868758B1 (en) 2012-10-31

Family

ID=36588915

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Application Number Title Priority Date Filing Date
EP20060738198 Active EP1868758B1 (en) 2005-04-15 2006-03-14 Power miter saw with miter and bevel angles sensing units, and digital displays therefor

Country Status (9)

Country Link
US (1) US7849774B2 (ru)
EP (1) EP1868758B1 (ru)
JP (1) JP5270333B2 (ru)
CN (1) CN101175595B (ru)
CA (1) CA2604478A1 (ru)
NO (1) NO20075191L (ru)
RU (1) RU2396151C2 (ru)
TW (1) TWI369260B (ru)
WO (1) WO2006112982A1 (ru)

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JP4820085B2 (ja) * 2004-01-16 2011-11-24 日立工機株式会社 卓上丸鋸
US7308845B2 (en) * 2005-10-07 2007-12-18 Bor-Yann Chuang Sawing angle indicating-and-reading device for a table sawing machine
US7293490B2 (en) * 2005-10-07 2007-11-13 Bor-Yann Chuang Sawing angle indicating device for a table sawing machine
US20070157782A1 (en) * 2006-01-12 2007-07-12 Hetcher Jason D Saw such as a miter saw with digital readout and related measurement devices
US8522657B2 (en) * 2007-10-12 2013-09-03 Ryobi Ltd. Slide-type cutting machine
US20090293691A1 (en) * 2008-05-30 2009-12-03 Gehret Robert S Detent Switch for a Power Tool
US8684624B2 (en) * 2008-07-01 2014-04-01 Saint-Gobain Performance Plastics Rencol Limited Tolerance ring
US8228647B2 (en) * 2008-11-17 2012-07-24 Wy Peron Lee Electrical power diagnostic system
DE112010005801T5 (de) * 2010-08-11 2013-06-13 Bosch Power Tools (China) Co., Ltd. Kreissäge mit Regelzubehör
CN102166671A (zh) * 2010-12-29 2011-08-31 青岛地恩地机电科技股份有限公司 角度显示系统
EP2888475B1 (en) * 2012-07-30 2016-09-14 Parker Hannifin Corporation Pump control system and method
US9505071B2 (en) * 2014-11-17 2016-11-29 Sears Brands, L.L.C. Onboard measuring system for miter saws

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JP4662299B2 (ja) * 2004-07-26 2011-03-30 日立工機株式会社 卓上切断機
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JP4820085B2 (ja) * 2004-01-16 2011-11-24 日立工機株式会社 卓上丸鋸
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JP4539196B2 (ja) * 2004-06-30 2010-09-08 日立工機株式会社 卓上切断機

Also Published As

Publication number Publication date
TWI369260B (en) 2012-08-01
NO20075191L (no) 2008-01-14
WO2006112982A1 (en) 2006-10-26
JP5270333B2 (ja) 2013-08-21
CN101175595B (zh) 2011-12-21
RU2396151C2 (ru) 2010-08-10
EP1868758A1 (en) 2007-12-26
US20060230902A1 (en) 2006-10-19
US7849774B2 (en) 2010-12-14
CN101175595A (zh) 2008-05-07
RU2007137676A (ru) 2009-05-20
CA2604478A1 (en) 2006-10-26
JP2008535677A (ja) 2008-09-04
TW200640597A (en) 2006-12-01

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